Results 31 to 40 of about 1,146,322 (163)

Auto-focus technology and its application based on image processing [PDF]

open access: yes, 2009
Auto-focusing technique is an important method to improve the precision,intelligentization,automatization for the indentation diameter measurement.The paper introduces an auto-focus method of indentation diameter measurement based on image processing ...
Chen, Xiaomei, Yang, Tao, Zuo, Yong
core  

氮肥基追比对小麦产量、土壤水氮分布及利用的影响

open access: yesShuitu Baochi Xuebao, 2020
为解决区域土壤质地类型针对性氮肥施用问题,在轻壤土和黏壤土上分别设置不施氮肥,氮肥基追比3:7,4:6,5:5,6:4和7:3处理,研究小麦产量、水氮利用效率以及土壤含水量、贮水量、NH4+-N、NO3--N动态变化规律。结果表明:轻壤质土壤氮肥基追比4:6的处理小麦产量、水分利用效率、氮肥生产效率最高分别为8 265.3 kg/hm2,27.6 kg/(hm2·mm),34.4 kg/kg。黏壤质土壤氮肥基追比5:5的处理小麦产量、水分利用效率、氮肥生产效率最高分别为8 363.2 kg/hm2,28.
袁浩   +7 more
doaj  

Sun Bear Ecology and Conservation: Multiscale Habitat Associations in Southeast Asia 马来熊的生态与保护:东南亚地区的多尺度生境关联研究

open access: yesIntegrative Conservation, Volume 5, Issue 1, Page 125-136, March 2026.
We collated detections of the sun bear from new and previously published camera trap studies across its range. We then analysed these detections at two different spatial scales to assess the habitat associations and diel activity of this species. We found that the sun bear is tolerant to moderate habitat disturbances. ABSTRACT Degraded tropical forests,
Alexander Hendry   +5 more
wiley   +1 more source

二级轻气炮弹丸速度、质量和位置测量 [PDF]

open access: yes, 1995
二级轻气炮发射的氘冰弹丸的速度、质量和显示弹丸完整性的方法和所使用的仪器以及新开发的以波长编码 ...
葛学真
core  

A Tale of Two Programs? Stigma and Administrative Burdens in CHIP and Medicaid

open access: yesWorld Medical &Health Policy, Volume 18, Issue 1, March 2026.
ABSTRACT One contributing factor to undersubscriptions is administrative burdens. To explore whether program stigma affects attitudes about administrative burdens, a survey (N = 2204) was fielded to assess differences in attitudes about seven policies decreasing administrative burdens and two policies increasing administrative burdens.
Simon F. Haeder
wiley   +1 more source

轻装上阵工程机械轻量化设计之势 [PDF]

open access: yes, 2013
轻量化已成为包括工程机械行业在内的制造业的一种发展趋势,开发节能环保的绿色工程机械已经被越来越多的国内工程机械企业作为核心的发展战略之一。“节能环保“日益成为全社会关注的焦点,用更小的消耗,产生更多的效用成为制造业追求的目标,轻量化技术因此也逐渐受到国内外制造业的重视。工程机械行业也不例外,特别是近年来,随着工程机械行业的迅速发展 ...
侯亮, 郭涛
core  

施肥对黑土密度分组中碳、氮的影响

open access: yesShuitu Baochi Xuebao, 2011
以中国科学院海伦农业生态实验站的长期定位施肥土壤为基础,研究长期施肥对黑土密度分组中碳和氮的影响。结果表明:氮肥能够增加土壤有机碳和全氮含量,但不如NPKOM效果明显。土壤中各组分有机碳含量的变化趋势为重组>游离态轻组>闭蓄态轻组,三者之间差异达极显著水平(p闭蓄态轻组>重组,且游离态轻组明显大于其它两个组分。NPKOM处理的闭蓄态轻组和重组组分中的有机碳浓度和全氮浓度大于其它施肥处理。碳氮比的变化趋势为游离态轻组>闭蓄态轻组>土壤>重组,重组和土壤中,NPKOM处理的碳氮比最低,CK处理的碳氮比最大 ...
芦思佳   +3 more
doaj  

Mesoporous Hollow Carbon Spheres/Nanofibers Anchored With Conductive Bimetallic for Efficient Microwave Absorption

open access: yesRare Metals, Volume 45, Issue 2, February 2026.
ABSTRACT To break electromagnetic wave absorption (EMA) tech's single‐attenuation bottleneck, enhancing multi‐wave absorption synergy in composites is key for microstructure design. This study uses mesoporous hollow carbon spheres to make metal nanospheres with cobalt, iron, and nickel nanoparticles, then encapsulates them via electrospinning into a ...
Wei‐Lian Zhang   +10 more
wiley   +1 more source

一种深海轻质高能量电池装置 [PDF]

open access: yes, 2017
本实用新型涉及海洋工程和水下科考装备领域,具体地说是一种深海轻质高能量电池装置,包括球状耐压干舱、电池舱支座、锂电池组和电池托架,其中锂电池组和电池托架设置于球状耐压干舱中,锂电池组固装在电池托架上,所述球状耐压干舱包括上球壳和下球壳,在所述上球壳上方设有第一安装半圈,在所述下球壳下方设有第二安装半圈,所述上球壳和下球壳通过密封带连接并通过所述第一安装半圈和第二安装半圈端部相连固定;在所述下球壳上设有上电插头、电源输出插头和真空嘴,所述锂电池组的电池上电线与所述上电插头连接 ...
李彬   +4 more
core  

坝上高原杨树人工林的枯落物及土壤水源涵养功能退化

open access: yesShuitu Baochi Xuebao, 2019
为探究坝上高原不同退化程度杨树人工林对枯落物及土壤水源涵养功能退化的影响,于2016年7-9月在张北县进行样地调查,对不同退化程度杨树人工林地枯落物及土壤水源涵养功能进行定量分析。结果表明:(1)林下枯落物储量表现为轻度退化(24.68 t/hm2) > 中度退化(13.43 t/hm2) > 重度退化(3.66 t/hm2),枯落物有效拦蓄量表现为轻度退化(29.28 t/hm2) > 中度退化(23.18 t/hm2) > 重度退化(3.30 t/hm2),最大持水量为轻度退化(34.90 t ...
孙立博   +5 more
doaj  

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